Daily update : Realized that I fucked up because my simulation was off. I will have to redo the measurements for the simulation. Maybe the impedance measurement was off. I quickly pulled some shit out of my ass and increased the zobel cap to 47uF. Looks (and sounds) much better now. Better tonality and deeper soundstage. Also much better off-axis response when standing up. Roll-off should probably be at a slightly lower frequency and more gentle. I won't reverse the bass driver for now. This is what it looks like without the usual B&K target compensation now. Right speaker. The right Fostex driver seems to extend a little better. This isn't super accurate - the measurements weren't taken at exactly the same spot, but it should give you a rough idea. I know I'm getting there eventually... EDIT: Also always helps to have the HD800 on hand for a quick reality check. These drivers are obviously less capable than the HD800, but as it is right now I also prefer the tonality of my modded HD800. My HD800 isn't all that much brighter, just mainly more extended (towards both ends). Midrange is more realistic on the HD800.